Radio aerial



RADIO AERIAL Filed July 1, 1929 Patented May 31, 1932 UNlT'ED STATES PENT o r-r1 cs EDGAR s. BROWN, or woncn's'rnn, mnssaoiiusn'rrs RADIOAERIAL Application filed July 1,

This invention relates to an aerial for use with radio receivingapparatus.

The principal objects of the invention are to provide a radio aerial insuch form that it will take up comparatively little room so that anumber of them can be mounted on the roof of a building, particularly anapartment house; to provide means whereby each element of the aerialconstitutes an induction coil and to provide the windings in suchrelation to each other that they will not interfere with each other butwill cooperate so that the entire length of the wire on the device willbe available for the purpose of intercepting and transmitting thevibrations ing in the direction of the arrow in Fig. l

and showing only a part of it and having part of it broken away to showinterior construction.

The problem of placing a plurality of straight aerial wires on the roofof a hotel or apartment house has become quite serious. With so manywires, they interfere with each other and the reception is poor on allof them usually. The conditions are such that in some cases goodreception cannot be secured by some of the receiving sets.

The principal object of this invention is to avoid this difficulty byproviding a form of aerial which can be placed outdoors on the roof andwill not be injured by rain or snow and which will permit the employmentof a wire longer than would ordinarily be set up and yet occupy verylittle space. It also is capable of being turned to proper position forreception and elimination of interference and then secured in thatposition. This aerial provides practically no wind resistance whenplaced in proper position and therefore it can be used under the body ofan aeroplane.

This is a very simple device and comprises 1929. Serial No. 375,094;

a support or post which preferably is arranged in vertical position: andis provided with a circular reduced endll, at the bottom of which is ashoulder on which rests a polygonal plate 12 other non-conductingmaterial. This plate 12 obviously can be turned. about the reduced end11 to any position in which it is found. that the reception is best andthen the parts can be fastened permanently in that position,

as by means of. a screw 13..

The wooden center l2'is shown as six-sided, but someothernuinber ofsidesmay be more convenient in some cases. From each side projects a rodll radially. Each of these 65 rods isof wood or other insulatingmaterial. covered with paint or other coating to protect itfrom theweather. (En-these rods is'wound the aerial 15 which consists of awirecovered with rubber. or other insulation to protect it from theweather. This wire is wound around one ofv these rods and then drawnthrough a perforation 16 near its end and then passes in the form of astraight strand 7 through a perforation 16 in the end of. the 75 nextrod. 1.4.. Then it is woundaround that rod. It is to be noticed that thewire is woundzfrom the inner end of the first-named rod 14: to the outerendand from'the outer end to the inner end of thesecond rod and it willalso be noticed that these two adjacent windings'are in oppositedirections; When used as an aerial, eachwinding constitutes an inductioncoil,- but they do not. interfere'because the adjacent ones are wound inopposite directions.

The aerial wire 15 is brought through a hole 18 inthe plate 12 at thecorner'and then wound on two other rods linzthesame way. In this way,whether there are three pairs or any other number, the windings arewound on in pairs and finally the end of the same wire is brought out,near the place where the first winding started, through perforations 18.All these perforations 16, 18 and 19 are made for the purpose of firmlyholding the coils in position, so that they will not uncoil under anyconditions. The perforations 18 are made U-shaped, as shown 1n Fig. 2,so 16% as to more firmly hold the wires in position.

which may be of wood or In this way it will be seen that the wire of theaerial is firmly held in position; that. the full length of the wire isavailable for the purpose of receiving the vibrations from the air, andthat it is located in a very small compass and a large number of theseaerials can be placed in proximity to each other on a roof or elsewhere.On account of the shape of the whole device and the induction coils, ofwhich it is formed, one aerial is not likely to interfere with anotherin any way if placed a few feet apart. Therefore each instrument willreceive the waves in a comparatively clear and uninterrupted manner.

Although I have illustrated and described only one form of theinvention, I am aware of the fact that modifications can be made thereinby any erson skilled in the art without departing rom the scope of theinvention as expressed in the claims. Therefore,

I do not wish to be limited to all thedetails of construction hereinshown and described, but

what I do claim is 1. As an article of manufacture, a receivlng I aerialfor radio purposes comprising a support having a plurality'of sides, aninsulating rod projecting from each side in a radial direction, anaerial wire wound around said rods in the form of coils and in regularorder, every two adjacent coils being wound in opposite directions, therods having perforations therethrough at each end for receiving the wireand holding it in position on the rod. and the central support having anirregular perforation therein through which the wire passes betweentwoof said rods to hold the wire againstmoving from one rod to the nextone, and the wires extending across from the perforations in theextremities of adjacent rods.

2. As an article of manufacture, a receiving aerial for radio purposescomprising a support having a plurality of sides, an insulating rodprojecting from each side in a radial direction, an aerial wire woundaround said rods in the form of coils and in regular order, the centralsupport having means through which the Wire passes between two of saidrods to hold the wire against moving from one rod to the next one, andthe wires extending across from the extremities of adjacent rods.

In testimony whereof I have hereunto affixed my signature.

EDGAR S. BROWN.

